1 files changed, 22 insertions, 0 deletions
diff --git a/net/ricketyspace/sicp/two/one.scm b/net/ricketyspace/sicp/two/one.scm
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+++ b/net/ricketyspace/sicp/two/one.scm
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+;;;; Under Creative Commons Attribution-ShareAlike 4.0
+;;;; International. See
+;;;; <https://creativecommons.org/licenses/by-sa/4.0/>.
+
+(define-module (net ricketyspace sicp two one)
+  #:export (make-rat))
+
+(define (gcd a b)
+  (if (= b 0)
+      a
+      (gcd b (remainder a b))))
+
+(define (make-numer n neg?)
+  (if neg? (* -1 (abs n))
+      (abs n)))
+(define (make-denom d) (abs d))
+
+(define (make-rat n d)
+  (let ((g (abs (gcd n d)))
+        (neg? (< (* n d) 0)))
+    (cons (/ (make-numer n neg?) g)
+          (/ (make-denom d) g))))